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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'eda6f4d9a55d6ac0261b55f433112f282c8591231dc122be6d774126a8bd827b' 
  AND token = '/lwZ798onVQb4gjTP2S/euCMiH6YjCjmBe9S1m5By5g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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