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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4c6d40b0e6250ac62cf701372ea8504b166fee60cbface7bb90a534c9d7ab5ff' 
  AND token = '2AsZMb2XEIwnZRkDpYp1IxlQCgQ36KCCMRlHgbeO+BY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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