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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6fffaac5ad44d8591ef4bb01ae91f2e3477bd42565aced678d2fe8ad5cefd5d4' 
  AND token = 'aZQUmgsukJ7JMj+qyjrOkCCIylNVg4pt99GvgtMroZU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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