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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '176fe66e3c2f9255a7d645a7fd93671ef5ba7fdc5031574c2da66acd55e45ba4' 
  AND token = 'HdH6lmTnQ3BsyL7Q6MxxwzL3kC3KhcF+2Bmapmg8uEs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00084

JSON explain

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