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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd9624424d736a2dee9d71f5d1245b493ffaaa9b8987a8013c2e7f67d52f74900' 
  AND token = 'su2zcxyrdDos2sVnlZcHIdwS/BlXztoeb7K3WYd6nZw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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