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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '752ff5392020e958a9ef8b6b019cd0b86408aa99d652b1eb8d9d9d90769a9c0d' 
  AND token = 'DGPMqoqheN8+igLs5mBjgs7Ddqs6nBhbY1uHVrcU64U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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