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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'fcb0429e9062ea3b7b9e8c6ab4c2621fcf7034e821fb040afb6ea46bc638e3ba' 
  AND token = 'Ubpv8iEvAF3CRkAsJCAa9zF4d9Llc7jYbSLVYlpXJ3E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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