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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'bb9d3e7daca0bb1dc6c12bd9adb38fe95b49f696e25fa171c6f739e71e0906a4' 
  AND token = 'jXCh0lcj+vh7WlPztKZyxiMUSslIUqRmDN1SSMLohns=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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