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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6beb1a5f3bebf97b5df7a250938d18832bacfc1f0ef8a1b08abc4a8ea04a9285' 
  AND token = 'Zw6sjAAYsrKrxBGikC1LAeU1JEAz6K1uT6gqgUiEguE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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