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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e562b31cacbb189303b39b39c29c6653d9fc66528b9fe9e1bb9fce9cd3afcfbb' 
  AND token = 'Kvcw9cjNP4N3gfO91Pet42YpLzzA4Y3fBO0SqG9gZWI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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