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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'fa995980f245c8cbc46ba4e7772b84cf509eaaeb0e46f4054a1367c497a96da7' 
  AND token = '8boq4D/vIFuCO2zKH/86WIMClDgXUWX4Keg1NGyoSyg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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