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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '53fe415934d425e37c1c40e25e8881da5e4fc5b234cd9987e99d1fa66215364a' 
  AND token = 'RfqDPiMXqHM/A2rZ7Izrk9dt6YF1qK+TwX9wUp2AUTo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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