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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8aba6fdc0b73d9decacfe36a7be17fcf607b8127bbd9bf9bf4a7fc911182ec64' 
  AND token = '7NE31q7PF7jWOYB//tqzS05nwg9ft1tMEedtUNbPWVY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00202

JSON explain

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