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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'fee1b835e77755cf342d61b8680a26bfaf52108e4bbee3542c0f8bc267bd87ed' 
  AND token = 'QGIrPAXdqnnLh60TlLV7QdwRQZ2NhxXE+gSxtZGNAUw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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