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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9999215369f6b6211898fb1955e0f4f1e7a646ce55cc9daf1835dc8e80e84181' 
  AND token = 'Cq061jVaHnDemJkPBm6Bi+ELu+aFTv0AKyS8OvbCDeY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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