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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c8a998bbb48564a857b65bb630be0843e8eb72bb0141898782164ea1afe8dd4f' 
  AND token = 's+1RY4Fy5I84PE++/eEArJxBur7T9Es4n5eQhnIdkm0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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