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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '89662a3810a8c24968c3fea37a36042ac05ea38a721e256df6a62ce7644018ec' 
  AND token = 'q6lImvjAIWmYlh51AzhQc5W3gpI22TplK+VjNo2hXRI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00137

JSON explain

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