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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c1d2fc805e4960e8b89207aea350604af430f23db9eb3ab217fd3b3eb818db57' 
  AND token = 'T7bDWxxkunQmyM2G9uBQ4y+pegmYeKnR5jY4X5QFp7M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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