SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f32d89681872d770aa56a43aef75fd6543b23eaf7f9554a248891d6f0d36645e' 
  AND token = 'EqagMDktPr1Rin3li7pvKSxE3csW7B0sJvY7JLuwuGU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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