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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '902ad0c9c95148bcb61082273a4e934993b23ad43c97d9e2e3d3ac5efc48834a' 
  AND token = 'i1wat0H0LdJFJOkNdPcswbb0lok485d6aCd1LtqY5Dg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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