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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2a3256764900a4194a4a91993008368b0512c47f0b6db6c2a2b2ca0b9aa5b0ef' 
  AND token = 'biK7VUX1nvrdP++HW0t1Y/an6NhkUI5QezyIBpHQO5g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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