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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f6a74dba65b47ccc66ecb0eb8216418646465aafadd9718c87bf516a38e6bc92' 
  AND token = '44I0Xj0VQgyQChxA31ec6KNLVCAxJ5wJEjrumvDtjc4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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