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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1d47cd77466418219643b548eca26ccfc31bab8386c4d5fc2d028a99ec78674d' 
  AND token = '95YlvEtkRlqDw84ugOYLpMqRMfDRNe4vqS2lFmcczik=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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