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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'df2dda3b234c4eb06a0bd98d3e691dcebc006454869661fe8a9235f6d140cd84' 
  AND token = 'BwrAZ/qoUxPr8HwHtOIO98Lqd5353VqbgV1Zm/4DBUY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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