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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e3d0680848675011f8824be1b054eec0898380dd101fa0e45caed8934ab81c16' 
  AND token = 'Ne6Aj/K61RiU1e8dQtz0A4rUL1Tg2zEHF5DaA8KwTf4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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