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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '74ce7d1c6b7fc4f993909dee3dce3f950bec1071b85dfa52988f05898d48e437' 
  AND token = 'XCxf4hrLAQVjjvWHBQVTNnUUidP6pMe6c/mabF28l0o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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