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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2a6ed8422c778a1425c077314705784046002bdbc724b519bd013aaca9d6e469' 
  AND token = 'rK/4EB6NzcoB3M/e69hxwyr+cqEbf7ipD4hggXhl7s8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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