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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '316a01e059e83f1e66c68a80b7b87519950fca0c088cf56cdfd038fa7ccc4ae7' 
  AND token = 'M9hIlpfM2/KXOLli0xXM7VEy4UjGHHeMXNNKpzNstK8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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