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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '378e38dd80ec2903612c2196645f0ed7b87e31acc9ac3bda49779513d7269895' 
  AND token = 'y2WuoLiwJgk7ELmY32uh3RqgecFVdsnujpaPHDaortw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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