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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e33d0830f8f2d7dc33cf360609994c800fb1113a54f6fb6d9189a0be08555dfd' 
  AND token = 'Uk6D2Kf1/k1pkWihI/6ca4d9WxLBIV+w6YNAczCVyNM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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