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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b5843dc289abb64feedc4b3ddfdac47577569a540a388e9d457a05bc53db08fe' 
  AND token = 'ADXw5DEZR33Y3XvZ7ZaPIgYS2sYdKOzGPQOvlgIjbGk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}