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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2a972e1b158dba8d0f8c5a23fafe710781a9bd8d38c6673d8cc8d79839492b78' 
  AND token = 'yQ5fc9CToqWZ8kraQww3FYwqVYHcx6tcxv+U9lrY9zw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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