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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '89604d661a9d41f1c32c93a970e1abc9928c1b9fa943b2dbb63dc64080cad75a' 
  AND token = 'nAZQOPtONku3oBCog+/6CofamfoZu0Fp4a1dgTYg+UU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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