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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd0042ff141ba7f02f81bdc40af1f40ab6ad7e0fa17185a9a867e074f94c5dc6d' 
  AND token = 'DYDMYEzdfvjIFcWuYRQL/SHxMSB5CXT9Mx3j1S6jKi4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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