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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6cb21dfc5d90932ca6f63deab32604c83e271cde70982637316ab005e8833cde' 
  AND token = 'ft7nAdEsSXuzQyAd/F1tWjqJWzx2BzYQgCDAjHGWbpM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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