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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5af7034d70759f461f1c798ff2faaacc1af82648850d87e6fd5800e460c55dfa' 
  AND token = 'veDlV2Q3Em2ohg7GQQvC4CUJ4Axk8F5mdRMBNmqJBy8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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