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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '80f0d1a6ada9640b0c9ba65b0424fbc65abd129037fdeefc75fc96a492e1d2db' 
  AND token = 'sEbBpA2CaGtLbTJUk4bZEv11HGbuWtPcyQHjUe/khBg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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