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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '88bfcfbf8494bcebfc628bbeb5a0a31631bc62913460ca3b6f8ab0dc27c8c2bb' 
  AND token = 'tTfBGi+2Omq9CotDzoP+RQiA5jo9Nj8J8tdliWBBaLQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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