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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6fee547375819bedd4f95cef6d5147fcb8095bcef9f54e7fa816bf6817f89d6a' 
  AND token = 'V7wnsT+4dexoplt3EUqz37J+3xzCqoa5uXRsfcS7w/Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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