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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '23f0f6d37992f9ca65dea45d1bdd350fea055bcf5674fa68a9e53648fcf8117a' 
  AND token = 'uTp8DA/Udj9UYrGhP4X4Ifoa91ijODEOUM0WjDMB+MU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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