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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '86d73fea35277a9b0eff23daa17c9c918538a6e31b711262a2af8560cac3e15e' 
  AND token = 'd4eiGB19Vq77cEVJxRh7ON228XcDerrorvmB5Y30u4M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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