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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4dc9d7e1f264d307a8ffd3c45bd9953cb8cdbf65bc16bf903c9437f7b41981db' 
  AND token = 'EOSIFxx54gyjUKH1EgDiGyJw9Gm39IxIParJvE70GFg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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