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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f2abade6ec762991d58d5852f9ffc4a4a6657416260a7549646b95ddba3ebf73' 
  AND token = 'McEwe63//pBy9juPjp6fQrqfI4DLGIFxYeHtXOsdMuY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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