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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'bfb16f1bb6a1bd1a483b1e5e65f9d4d21cb3fc0d34351fed3d0ea54876cf6159' 
  AND token = 'hgt65M5TNtrSZjj7VNUkxLBze04Gani/yCyT50h/yGc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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