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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9ce8037da8aafc8aa2a55f66d93ddd9da9abdceef2ae6920c68f1c1369548c4d' 
  AND token = 'EtnWJ36yF+e82mHB9MkCjigFZ8oGonH/RKLoFz4B3iw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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