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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '665b58ede4fa65984a15c54563476bcb570685dc0ed1be238aa4192ce24b0d8c' 
  AND token = 'vlJrjjzlhVtVi1x46ADkjvtC5F+GGRXxr7htILLNkXQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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