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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd08eed300e891c77460dcf4d61f1e60a622d5cf6b19f02a131c1bf5ad0f673da' 
  AND token = 'TStqLQZHbw0E5jqxQddCebvy3pTlzJQGMAqc7FbZCc8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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