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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd8e9c977d25e15f7df73fc5e94717abdf5c846f4531b04d76f610ee65f35c114' 
  AND token = 'vV3/aptmlQ7PObE5UjJwD1/UuFYeFe8kZgaOYX+lebk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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