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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4038920ac3d28f36befbea6ae3e86052e15adf81e77caa903c5c351d77f6a69b' 
  AND token = 'i/Zvmi3u54clcmdtiRIqQQLWQntMiJ7C1oM4GnoPinQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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