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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '98e5f231f5767ffb6c925d5c0202fadd12ae17c7b9b0e7e4e340e9d32116e7e2' 
  AND token = 'UL9fKhAhdKsDYvTgv1nRRDFAb9R0jRy3HkUM1b/esCM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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