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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8b52360bf59e093be020133cc78f62c10398a878329eb28b143460660b8f34fe' 
  AND token = 'A6b/aZ/q5a8ejmO+hNcGV8Tx6p6gxmGYy5rHKx9raCU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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