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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a44c824749afdc4d57a433a1bb35b6b0577323f464de9ff8ae3a59f976f366ef' 
  AND token = 'Tk5Z5iyTNBj3/M4lyTbifPR8Y4W15j3IjWWQMLD4V38=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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