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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'aaa9041aec4dcf9fbb44594aca52bab5ee94baf9ed0e46f756d5fe1e687854ea' 
  AND token = 'altpifJAgSsA5vmJSZ5055NREp1ZcjJzfSEDrwSuEqY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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