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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e6d347442572c02ed59b756c2c31ad08f7e79ea64584f16bd5560ea4059dcdff' 
  AND token = 'RbcR+KdqO3zfV6UDk0Z/J94zKIOG7k203sEexvcCMag=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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