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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3e9e35a23deb1a0d09e5493e6ea11c8b44ab6bc22aefed8035ee36304f1cdeb2' 
  AND token = '7I3Bg1vKG58B3ahcv7OvKHJWbYnQzKhhl9WPfywFrXo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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