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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ae3a4d88c48a1b7cdee4c51865ef8314ae9422095955c3730c8c9566f0ec2839' 
  AND token = 'mDoUeIUFhQydTfUrcKVIYjhcDpDg3KGkXrHg50CRslo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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