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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '23451485ce347706a42e5114dd2cf7c9717ea4123aa1404524ec2d0b7c54c3a6' 
  AND token = 'cArE69rlazPCnyqv9FHeYC8Rd48pydnkeyN+epYublI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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