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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f2a6859689fe73c52ab21e4fb91140a3b4637d5386403449689a85b149613d34' 
  AND token = '6TY3IgRnL8NgqGWxXFMrIE1Y4paipaU3jCtm5kX4s5U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00296

JSON explain

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